| Jaagup | | - | Estonian | |
| Jaak | | - | Estonian, Flemish | |
| Jaakob | | - | Finnish (Rare), Estonian (Rare) | |
| Jaan | | - | Estonian | |
| Jacinta | | hah-THEEN-tah (Spanish), hah-SEEN-tah (Latin American Spanish) | Spanish, Portuguese | |
| Jacinto | | hah-THEEN-to (Spanish), hah-SEEN-to (Latin American Spanish) | Spanish, Portuguese | |
| Jacob | | JAY-kəb (English), YAH-kawp (Dutch) | English, Dutch, Swedish, Norwegian, Danish, Jewish, Biblical | |
| Jacobine | | yah-ko-BEE-nə (Dutch) | Norwegian, Danish, Dutch | |
| Jacobo | | hah-KO-bo | Spanish | |
| Jacobus | | yah-KO-bus (Dutch) | Dutch, Late Roman | |
| Jacopo | | YAH-ko-po | Italian | |
| Jadran | | - | Croatian, Serbian, Slovene | |
| Jadranka | | - | Croatian, Serbian, Slovene | |
| Jadranko | | - | Croatian, Serbian, Slovene | |
| Jadvyga | | - | Lithuanian | |